Lugaru struck me as one thing: hard, as in hardcore. You had to want to play that twicth based, really hard combat to enjoy it. As much as achievements have challenged me to play on hard again (and I've risen to said challenge is some games known for being hard, though not Demon's Souls) I just wasn't up for it. But I played a couple hours and I thought the core mechanic was very solid (which was the feeling of the fighting). I would expect Overgrowth to be the same.